Frederick berner



Patented Jan. I0, 1899.

No. 6I7,39l.

F. BEBNER, 1n. DRYING APPARATUS;

(Application filed Apr. 12. 1898.) v

' 2 Sheets-Sheet l.

(N0 Model.)

WITNESSES //v VENTOR q i'redwickBemmrir BY THE NORRIS Prrifls 00.PNQ'ro-umQ. WASHINGTON D. c.

Patented lam I0, I899. r. BERNER, In. nnvma APPARATUS.

(Application filed Apr. 12, 1898.)

2 sheets-sheet 2-.

(No Model.)

. //v VENTOI"? PM BemexJr gTNESSiS UNITED STATES PATENT OFFICE.

FREDERICK BERNER, J It, OF INDIANAPOLIS, INDIANA.

DRYING APPARATUS.

SPECIFICATION forming part of Letters Patent No. 617,391, dated January10, 1899.

Application filed April12,1898. Serial No. 677,311. (No model.) 7

T0 (0% whom it may concern.-

Be it known that I, FREDERICK BERNER,Jr., a citizen of the UnitedStates, residing at Indianapolis, in the county of Marion and State ofIndiana, have invented certain new and useful Improvements inDrying-Cylinders, of which the following is a specification.

My present invention relates to a revolving cylinder which forms a partof a drying apparatus. It is primarily designed as a sanddrier, and asit has so far been used it constitutes a part of a portable asphaltplant-- such, for example, as forms thesubject-m'atter of Letters Patentof the United States No. 540,912, dated June 11, 1895, and No. 585,867,dated July 6, 1897. It may, however, be used either in such an apparatusas that shown in said Letters Patent or in any other situation whererapid and effective drying of sand or any similar granular substance isdesired to be efiected.

Said invention principally consists in securing within the interior ofthe drying-cylinder and within the spiral ribs or conveyer-fiights, bywhich the sand or other substance is caused to move lengthwise of saidcylinder, a series of overlapping plates having spaces bet-ween them,whereby the sand or other substance during its progress through thecylinder is more evenly distributed and thoroughly subjected to theaction of the heat and at the same time prevented from dropping into theair-blast or forced draft, which in such a machine is caused to passthrough said cylinder in an opposite direction to the movement of thesand or other substance being treated.

Referring to the accompanying drawings, which are made a part hereof andon which similar letters of reference indicate similar parts, Figure 1is a longitudinal vertical section through the furnace and sand-dryingcylinder of such a portable asphalt plant as is above referred to, saidcylinder being provided with my invention; Fig. 2, a transversesectional view of the cylinder separately, and Fig. 3 a perspective Viewof one of the struts by which the curved overlapping plates aresupported.

As shown in Fig. 1, with the exception of said curved overlapping platesand their supporting-struts the construction of the apparatus is thesame as has heretofore been used, and as the same forms no part of mypresent invention it will not be further described herein, exceptincidentally in describing the invention.

In the drawings, A representsthe' shell of the rotating cylinder; B, thespiral ribs or conveyer-flights; (J, the peculiarly-formed struts usedin my present invention, and D the plates which are mounted thereon.

The cylinder A, as shown in Fig. 1, is mounted to rotate within thefurnace structure. By means of an eXhaust-fanF a forced draft is createdfrom the combustion-chamber through the cylinder to the smoke-stack K.

The spiral ribs or conveyer-fiights B are secured within the cylinderand serve in the usual and well-known manner to cause the sand or othersubstance to move lengthwise the cylinder in operation while saidcylinder is in motion. The sand enters through a suitable spout S, isconveyed to within the cylinder A by an ordinary conveyor R, anddischarges through the same openings a that the products of combustionenter.

The struts O are provided with feet 0, by which they are adapted to bestrongly secured to the interior of the cylinder A, while their innerends 0 are formedto receive the innermost edges of the plate D, and atan intermediate point they are provided with shelf-like bearings 0 uponwhich the outer edges of the plates D rest. As best shown in Fig. 2, theplates D are carried on the struts G in such a manner that one edge isconsiderably nearer the interior of the shell A than the other and alsoso that the edges overlap each other, but have a considerable spacebetween them. I

The plates D are disposed longitudinally parallel with the shell of thecylinder A, but circumferentially. \Vhile formed with a curvaturesimilar to that of the cylinder-shell, they diverge therefrom, so thatone edge of each is nearer the axis of the structure than the other. Forwant of a better term I will denominate those edges which are nearestthe cylinder-shell as the outer edges and those which are nearest theaxis as the inner edges. The struts C are designed to carry one edge ofeach of two plates, the outer edge of one and the inner edge of another,and the arran gement is preferably such that the plates overlap eachother, with a considerable space between the edges of any two adjacentplates. The sand when it is first introduced into the cylinder passesthrough these spaces to between the plates and the cylinder-shell. Thisit may easily do on account of the arrangement of the plates and thedirection of rotation of the cylinder; but on account of the same factslittle, if any, of it can return to within the space inside the platesduring the subsequent progress of the operation of the apparatus. Theseplates being subject to the direct action of the products of combustionas they pass through the cylinder, become highly heated, and the sand isthus much more rapidly dried than in a cylinder which does not containsuch plates, and so the capacity of the apparatus is much increased bytheir use, and the sand can be heated to a much higher temperature, as Ihave demonstrated by actual practical test.

The operation is as follows: The sand or other material shortly afterbeing introduced into the interior of the cylinder A in its wet or dampstate reaches a position where it rests upon the interior surface ofsaid cylinder. The interior of the cylinder is provided with projectingribs or lifting-plates r, as shown in the central portion of Fig. 1,where the plates D are broken away, and these continually raise the dampor wet sand from the bottom and carry it up to above the center of thecylinder, whence it falls down again, being at the same time continuallymoved lengthwise the cylinder by means of the spiral ribs orconveyor-flights B. In the construction shown, which embodies myimprovement, the sand as it falls drops onto the outer sides of theplates D and as it strikes spreads over the surface of the plate withwhich it comes in contact. These plates being within the cylinder anddirectly subject to contact with the products of combustion as the sameare drawn therethrough are highly heated, and the consequence is thatthe sand which comes in contact therewith is rapidly dried and heated toa high temperature. By said plates also the sand is prevented fromdropping to within the center of the cylinder into the draft whichpropels the products of combustion toward the smoke stack, and thus isnot subject to the force of said draft. In driers uuprovided with myinvention a large proportion of the sand is carried out by the draft andwasted.

Having thus fully described my said invention, what I claim as new, anddesire to secure by Letters Patent, is-

1. A rotary drier containing conveying devices whereby the material tobe dried is caused to move longitudinally thereof, and a series ofplates within the conveying devices the edges of which overlap eachother and have spaces between them whereby the material being dried isprevented from falling into the center of the space within the cylinderwhere it would be drawn out by means of the blast and is at the sametime distributed over more heating-surface whereby itis dried and heatedmore rapidly.

The combination, in a drier, of a rotating drying-cylinder, conveyingdevices witlr in said cylinder, and a series of plates within saidcylinder inside of said conveying devices and extending longitudinallyof the cylinder, one edge of each of which is nearer the shell of thecylinder than the other and which overlaps the edge of the adjacentplate.

3. The combination, in a drier, of the rotary cylinder,supporting-struts within said cyl inder having bearings at two points ofelevation, and plates secured to said struts, one edge of each platebeing thus held farther from the cylinder-shell than the other,substantially as shown and described.

4. The combination, in a drier, of a rotary cylinder A, spiral ribs orconveyor-flights B within said cylinder and next its shell, overlappingplates D within the cylinder and iiiside the ribs or conVeyer-flightstherein, and suitable supports for said last-named plates.

In witness whereof I have hereunto set my hand and seal, atIndianapolis, Indiana, this 5th day of April, A. D. 1898.

FREDERICK BERN ER, JR.

Vitnesses:

CHESTER BRADFORD, JAMES A. WALSH.

